1. Preheat oven to 350 F.
2. Place the walnuts in a food processor for 30 seconds or until finely chopped.
3. Place the ground walnuts, flour and cinnamon in a bowl and combine.
4. Place the butter, sugar and vanilla extract in a standing mixer or bowl using a hand mixer and cream for 3-4 minutes.
5. Slowly add the flour mixture to the butter mixture until combined.
6. Using a cookie scooper, scoop out the dough and place on a silpat or parchment lined baking sheet.
7. Bake for 15 minutes.
8. Dust with confectioners' sugar and serve.